Term
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Definition
Normal Sinus Rhythm
nRate: 60 to 100 bpm
nRhythm: Regular
nP Waves: Normal
nPR Interval: Normal
nQRS Complex: Normal, unless IVCD |
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Term
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Definition
Sinus Arrhythmia
Rate: Variable
Rhythm: Irregular
P Waves: Normal, P-P intervals gradually lengthening and shortening
PR Interval: Normal and constant
QRS Complex: Normal, unless IVCD |
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Term
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Definition
Sinus Bradycardia
nRate: < 60 bpm
nRhythm: Regular
nP Waves: Normal
nPR Interval: Normal, or prolonged
nQRS Complex: Normal, unless IVCD |
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Term
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Definition
Sinus Tachycardia
nRate: > 100 bpm
nRhythm: Regular
nP Waves: Normal
nPR Interval: Normal
nQRS Complex: Normal, unless IVCD |
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Term
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Definition
Premature Atrial Contractions
nRate: Variable
nRhythm: Irregular
nP Waves: Normal, P-P intervals gradually lengthening and shortening
nPR Interval: Normal and constant
nQRS Complex: Normal, unless IVCD |
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Term
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Definition
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Term
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Definition
PSVT
nRate: 150-250 bpm (adults and children)
nRhythm: Regular
nP Waves: Frequently not identified; if seen they bear a constant relationship to the QRS complex and are usually inverted in II, III, aVF
nPR Interval: Usually not measurable
nQRS Complex: Normal, unless IVCD |
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Term
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Definition
Atrial Flutter
nRate: 250-350 bpm (atrial); 150 bpm > (ventricular) – adult (usually)
nRhythm: Regular (atrial); regular or irregular (ventricular)
nP Waves: Flutter waves – “saw tooth” appearance; two or more precede each QRS
nPR Interval: Not measured
nQRS Complex: Normal, unless IVCD |
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Term
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Definition
Atrial Fibrillation
nRate: Atrial (too rapid to determine); ventricular - variable
nRhythm: Irregular (both atrial and ventricular)
nP Waves: Not identifiable or chaotic looking
nPR Interval: Not measurable
nQRS Complex: Normal, unless IVCD |
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Term
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Definition
Premature Ventricular Contraction
nRate: Any
nRhythm: Irregular
nP Waves: PVCs not preceded by premature P’ waves
nPR Interval: Not present unless PVC is end-diastolic, then PR interval is < sinus-conducted PR
nQRS Complex: 0.12 seconds or wider |
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Term
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Definition
Ventricular Tacchycardia
nRate: 100 to 250 bpm
nRhythm: Regular. May be slightly irregular. Polymorphic VT usually irregular.
nP Waves: May or may not be identifiable; May be retrograde atrial depolarization. AV dissociation may be present
nPR Interval: Not relevant
nQRS Complex: 0.12 seconds or wider. Ventricular flutter QRS not differentiated from ST segment and T wave . |
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Term
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Definition
Ventricular Fibrillation
nRate: Too fast to count
nRhythm: Grossly irregular
nP Waves: Not identifiable
nPR Interval: None
nQRS Complex: Not differentiated |
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Term
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Definition
1st degree AV Block
nRate: Any
nRhythm: Regular
nP Waves: Normal
nPR Interval: Above 0.20 seconds
nQRS Complex: Normal, unless IVCD |
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Term
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Definition
2nd Degree AV Block (I Wenckebach)
Rate: Usually within normal ranges
nRhythm: Atrial - Regular
nP Waves: Normal
nPR Interval: Progressively lengthening
nQRS Complex: Normal, unless IVCD |
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Term
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Definition
2nd degree AV block (II)
nRate: Atrial – Within normal ranges; Ventricular – May become very slow
nRhythm: Irregular because of sudden dropping of QRS
nP Waves: Constant P-P interval
nPR Interval: Constant with two consecutively conducted P waves
nQRS Complex: Sudden absence of QRS; often wide |
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Term
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Definition
3rd degree AV block
nRate: Atrial – Faster than ventricular; Ventricular – Usually < 45 bpm
nRhythm: Atrial – regular; Ventricular -regular
nP Waves: Normal
nPR Interval: P waves bear no constant relation to QRS complexes
nQRS Complex: Narrow – junctional pacemaker; Wide - ventricular pacemaker |
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Term
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Definition
Left Bundle Branch Block
nProlonged duration of QRS complex – 0.12 seconds or more
nWide R wave in V6 that may be slurred or notched
nQS or rS with slick downstroke, reaching nadir within 0.06 seconds |
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Term
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Definition
Right Bundle Branch Block
nProlonged duration of QRS complex -0.12 seconds or more
nTriphasic QRS complex : V1 – rSR’, V6 – qRS |
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